{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{3}{c}}
\toprule
                    &\multicolumn{1}{c}{Informal Contract}&\multicolumn{1}{c}{Informal Firm}&\multicolumn{1}{c}{Casual Work}\\\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}\\
\midrule \multicolumn{3}{l}{\textit{\textbf{Panel A: Informal Contract = 1}}} \\ \midrule
Constant            &        1.00&        0.79&        0.88\\


\midrule \multicolumn{3}{l}{\textit{\textbf{Panel B: Informal Firm = 1}}} \\ \midrule
Constant            &        0.70&        1.00&        0.82\\


\midrule \multicolumn{3}{l}{\textit{\textbf{Panel C: Casual Workers = 1}}} \\ \midrule
Constant            &        0.87&        0.91&        1.00\\
\bottomrule
\end{tabular}
}
